Extradosed and Intradosed Cable-Stayed Bridges with Continuous Cables: Conceptual Consideration

Abstract

A new type of combined cable-stayed bridge, named the extradosed and intradosed cable-stayed bridge with continuous cables, is presented to improve the mechanical behavior of the traditional extradosed bridges. The cable-girder anchorage is innovated to be suited for traditional extradosed bridges, which makes the girder supported by a group of continuous cables with larger eccentricity above and under the deck simultaneously. This paper evaluates the structural performance of the innovative structural scheme through parametric studies and detailed comparisons with traditional ones. Preliminary analyses show the advantages of the innovative structure, such as decreased bending response and deflection of the deck because of larger stiffness, smaller cable forces and increments, better dynamic resistance, and less amount of material.